Aris N. Tsois

I was born on March 13th, 1971. In 1989 I graduated from high-school and after national level exams I became a student at the Electrical and Computer Engineering Department of the National Technical University of Athens (NTUA). In February 1995, after completing my diploma thesis concerning Active Databases, I graduated from NTUA.

In December 1995 I started Ph.D. studies at the E.C.E. Department of NTUA under the advisory of prof. Timos Sellis. Since then my research is focused on Databases and Artificial Intelligence. 
 

Research Interests

OnLine Analytical Processing, Data Warehousing, Query Optimization,  Update Propagation, Artificial Intelligence, Planning.
 

Publications

Aris Tsois, Timos Sellis: The Generalized Pre-Grouping Transformation: Aggregate Query Optimization in the Presence of Dependencies. VLDB 2003.

Roland Pieringer, Klaus Elhardt, Frank Ramsak, Volker Markl, Robert Fenk, Rudolf Bayer, Nikos Karayannidis, Aris Tsois, Timos Sellis: Combining Hierarchy Encoding and Pre-Grouping: Intelligent Grouping in Star Join Processing. ICDE 2003.

Dimitri Theodorato, Aris Tsois: Processing OLAP queries in hierarchically clustered databases. DKE 45(2): 205-224 (2003)

Nikos Karayannidis, Aris Tsois, Timos Sellis, Roland Pieringer, Volker Markl, Frank Ramsak, Robert Fenk, Klaus Elhardt, Rudolf Bayer: Processing Star Queries on Hierarchically-Clustered Fact Tables. VLDB 2002.

Aris Tsois, Nikos Karayannidis, Timos Sellis, Dimitri Theodoratos: Cost-based optimization of aggregation star queries on hierarchically clustered data warehouses. DMDW 2002.

Dimitri Theodoratos, Aris Tsois: Heuristic Optimization of OLAP Queries in Multidimensionally Hierarchically Clustered Databases. DOLAP 2001.

Nikos Karayannidis, Panos Vassiliadis, Aris Tsois, Timos Sellis: ERATOSTHENES: Design and Architecture of an OLAP System, 8th PANHELLENIC CONFERENCE ON INFORMATICS, 2001.

Aris Tsois, Nikos Karayannidis, Timos K. Sellis: MAC: Conceptual data modeling for OLAP. DMDW 2001.

Nikolaos S. Papaspyrou, Aris Tsois, Emmanuel S. Skordalakis: An Object-Oriented Simulation Program Generator. WODES 1998. 

Aris Tsois, S. G. Tzafestas: Sources of Efficiency in Planning: A Survey. Accepted for publication Nov. 1998.

Nikolaos S. Papaspyrou, Aris Tsois: An Object-Oriented Simulation Program Generator. CAiSE'96 - 3rd Doctoral Consortium 1996. 

Projects

• EDITH
• DWQ
• NIVEMES

Contact Information